Firefox is a great browser in itself and has a large fan following. But quite frequently we tend to bloat up our favorite browser with unwanted addons. This not only the cause of slowness of Firefox but also causes Firefox to crash a lot. It is very frustrating when we are working on the middle of something important and Firefox either hangs or crash. But a bloated browser shouldn’t be a reason for your hatred.
Although you can try manually to remove all the addons, clear history etc. but this doesn’t mean that it will restore your Firefox settings to default or fix it. There may be some hidden setting left in your Firefox installation which can still cause Firefox to hang or crash. Here is how you can reset Firefox completely to its factory setting.